A geyser is a hot spring that periodically ejects water and steam into the air. This usually happens at more or less timed intervals. The name geyser is derived from the famous "Geysir" on Iceland.

It occurs when water is warmed by enormous heat near the surface which is caused by volcanism. In underground reservoirs, water boils and steam accumulates. When the pressure becomes too great, the steam pushes a fountain with water and steam upwards. Afterwards, the water cools off and flows back into the reservoir, and so the process can repeat itself. Geysers occur in a few places on Earth, such as in Iceland, Yellowstone park (United States), New Zealand and Alaska.

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